Hello and welcome,My name is ***** ***** I’m a biologist with a special interest in small animal health. I'm sorry to hear of this problem. Some additional information will be useful.Do any of his toes look red or swollen?What kind of litter/bedding do you use?What is the floor surface - wire, plastic, etc.?What do you feed him, both basics and treats? any supplements?How is his appetite today?Thank you.Anna